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Home >> Lexus >> 2006 >> IS 250 RWD, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Brake Control) >> VEHICLE STABILITY CONTROL SYSTEM (w/ VDIM) >> DTC C1380/64 Stop Light Control Relay Malfunction >> Wiring Diagram

DTC C1380/64 Stop Light Control Relay Malfunction: Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Wiring Diagram (1 Of 2)
G04052139Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Wiring Diagram (2 Of 2)
G04052140Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: When replacing the skid control ECU, perform zero point calibration (See CALIBRATION  ).

HINT:

When C1249/49 is output together with C1380/64, inspect and repair the trouble areas indicated by C1249/49 first.

  1. INSPECT STOP SW FUSE 
    1. Remove the STOP SW fuse from main body ECU RH.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      STOP SW (7.5 A) fuse Always Below 1 Ω
      Fig 3: Inspecting Stop SW Fuse
      G04052141Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPLACE STOP SW FUSE 

    OK : GO TO NEXT STEP 

  2. CHECK STOP LIGHT OPERATION 
    1. Install STOP SW fuse.
    2. Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released.

      OK 

      CONDITION CHART

      Condition Illumination Condition
      Brake pedal depressed ON
      Brake pedal released OFF

    NG : INSPECT STOP LIGHT CIRCUIT 

    OK : GO TO NEXT STEP 

  3. INSPECT SKID CONTROL ECU (STP1 TERMINAL) 
    1. Disconnect the skid control ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J77-10 (STP1) - Body ground Stop light switch ON (Brake pedal depressed) 8 to 14 V
      J77-10 (STP1) - Body ground Stop light switch OFF (Brake pedal repressed) Below 1.5 V
      Fig 4: Inspecting Skid Control ECU (STP1 Terminal)
      G04052142Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 CIRCUIT) 

    OK : GO TO NEXT STEP 

  4. INSPECT SKID CONTROL ECU (STP2 TERMINAL) 
    1. Disconnect the skid control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J77-10 (STP1) - A35-20 (STP2) Always Below 1 Ω
      Fig 5: Inspecting Skid Control ECU (STP2 Terminal)
      G04052143Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT) 

    OK : GO TO NEXT STEP 

  5. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (STOP LIGHT CONTROL RELAY) 
    1. Reconnect the skid control ECU connectors.
    2. Connect the intelligent tester to the DLC3.
    3. Start the engine.
    4. Select the Active Test mode on the intelligent tester.

      ABS / VSC: 

      TEST DETAIL CHART

      Item (Display) Vehicle Condition / Test Details Diagnostic Note
      STOP LAMP RELAY Turns stop light control relay ON / OFF Stop light comes on (Does not come on for 5 seconds or more)
    5. Check that the "ON" and "OFF" of the stop light can be shown on the rear combination light by the intelligent tester.

      OK: The stop light turns on or off in accordance with the intelligent tester. 

    OK : Go to step   9 

    NG : GO TO NEXT STEP 

  6. INSPECT STOP LIGHT CONTROL RELAY 
    1. Turn the engine switch off.
    2. Remove the stop light control relay.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      3 - 4 Always Below 1 Ω
      3 - 5 Always 10 kΩ or higher
      3 - 4 When battery positive voltage is applied to terminal 1 and battery negative voltage to terminal 2 10 kΩ or higher
      3 - 5 When battery positive voltage is applied to terminal 1 and battery negative voltage to terminal 2 Below 1 Ω
      Fig 6: Inspecting Stop Light Control Relay
      G04052144Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPLACE STOP LIGHT CONTROL RELAY 

    OK : GO TO NEXT STEP 

  7. INSPECT STOP LIGHT CONTROL RELAY (POWER SOURCE TERMINAL) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      Stop light control relay terminal 5 - Body ground Always 8 to 14 V
      Stop light control relay terminal 2 - Body ground Engine switch on (IG) 8 to 14 V
      Fig 7: Inspecting Stop Light Control Relay (Power Source Terminal)
      G04052145Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

    OK : GO TO NEXT STEP 

  8. INSPECT SKID CONTROL ECU (STPO TERMINAL) 
    1. Turn the engine switch off.
    2. Install the stop light control relay.
    3. Disconnect the skid control ECU connector.
    4. Turn the engine switch on (IG).
    5. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A35-21 (STPO) - Body ground Engine switch on (IG) 10 to 14 V
      Fig 8: Inspecting Skid Control ECU (Stpo Terminal)
      G04052146Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (STPO CIRCUIT) 

    OK : GO TO NEXT STEP 

  9. RECONFIRM DTC 
    1. Turn the engine switch off.
    2. Reconnect the skid control ECU connector.
    3. Clear the DTC (See DTC CHECK / CLEAR  ).
    4. Check if the same DTC is recorded (See DTC CHECK / CLEAR  ).

      Result 

      CONDITION CHART

      Condition Proceed to
      DTC (C1380/64) is not output A
      DTC (C1380/64) is output B

    B : REPLACE SKID CONTROL ECU 

    A : USE SIMULATION METHOD TO CHECK 

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